Motorola 700 Series User Manual

ROMboot
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3
ROMboot
As shipped from the factory, 162Bug occupies an EPROM installed
in socket XU2. This leaves one socket (XU1) and the Flash memory
available for your use. Contact your Motorola sales office for
assistance. This function is configured/enabled by the
Environment (
ENV) command (refer to Appendix A) and executed
at powerup (optionally also at reset) or by the
RB command
assuming there is valid code in the memory devices (or optionally
elsewhere on the board or VMEbus) to support it. If ROMboot code
is installed, a user-written routine is given control (if the routine
meets the format requirements). One use of ROMboot might be
resetting SYSFAIL* on an unintelligent controller module. The
NORB command disables the function.
For a user's ROMboot module to gain control through the ROMboot
linkage, four requirements must be met:
❏ Power must have just been applied (but the ENV command
can change this to also respond to any reset).
❏ Your routine must be located within the MVME162LX
Flash/PROM memory map (but the
ENV command can
change this to any other portion of the onboard memory, or
even offboard VMEbus memory).
❏ The ASCII string ‘‘BOOT’’ must be located within the
specified memory range.
❏ Your routine must pass a checksum test, which ensures that
this routine was really intended to receive control at
powerup.
For complete details on how to use ROMboot, refer to theDebugging
Package for Motorola 68K CISC CPUs User's Manual.

Motorola 700 Series Specifications

General

Brand	Motorola
Model	700 Series
Category	Controller
Language	English

Summary

Safety Summary

Lithium Battery Caution

Warns about the danger of explosion if the lithium battery is replaced incorrectly.

Board Level Hardware Description

Hardware Preparation and Installation

Unpacking and Hardware Preparation

Jumper Configuration

Lists and explains the function of various jumper headers for board configuration.

MVME162LX Installation

Step-by-step instructions for installing the MVME162LX into a VME chassis.

Debugger General Information

162Bug Overview and Implementation

Installation, Startup, and Booting

Covers 162Bug installation, startup, autoboot, ROMboot, and network boot procedures.

Restarting the System

Disk and Network I/O Support

Using the 162Bug Debugger

Entering and Managing Commands

Explains entering commands, terminal I/O control, command syntax, and parameters.

Debugging Programs and Memory

The 162Bug Debugger Command Set

Summarizes the available 162Bug debugger commands and their syntax.

Configure and Environment Commands

Board Information Configuration

Environment Setup

Troubleshooting CPU Boards

Solving Startup Problems

Provides simple troubleshooting steps for CPU board startup difficulties.